Double-Mode RR Lyrae Variables in the Globular Cluster M3

Details Double-Mode RR Lyrae Variables in the Globular Cluster M3 Double-Mode RR Lyrae Variables in the Globular Cluster M3

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aj....117.1332c&link_type=abstract

The Astronomical Journal, Volume 117, Issue 3, pp. 1332-1340.

Astronomy and Astrophysics

Astronomy

16

Globular Clusters: Individual (M3), Stars: Evolution, Stars: Variables: Rr Lyrae Variable

Scientific paper

We present new B-band CCD photometry for five double-mode RR Lyrae (RRd) variables (V68, V79, V87, V99, and V166) in the globular cluster M3. The pulsational behavior of the RRd variables is described. V68 and V87 have been known as RRd variables since 1982, V79 was recently discovered as an RRd (Clement et al.), and our data have identified V99 and V166 as RRd variables (Corwin et al.). Earlier studies of V79 and V166 do not show double-mode behavior, which indicates that these stars have only recently become RRd stars. V166 changed its dominant pulsation mode from fundamental to first overtone in the interval 1992 to 1993. The candidate double-mode variables V28 and V126 do not exhibit clear RRd behavior in the 1992-1993 data.

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